Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27288 results found.

  1. Konus-Wind observation of GRB 080607
  2. GRB080607: RTT150 optical observations
  3. GRB 080607: Swift-XRT refined analysis
  4. Swift/UVOT Observations of GRB080607
  5. GRB 080605: optical observations
  6. GRB 080607 KAIT observations
  7. VLA detection of INTEGRAL burst GRB 080603A
  8. Konus-Wind observation of GRB 080605
  9. GRB 080607: Enhanced Swift-XRT position
  10. GRB 080607, Swift-BAT refined analysis
  11. GRB 080605: GROND 2nd epoch observations
  12. GRB 080607 - PAIRITEL NIR detection
  13. GRB 080607: Swift detection of a burst with optical afterglow
  14. GRB 080607: ROTSE-III Detection of Optical Counterpart
  15. GRB 080605: Swift-UVOT refined analysis
  16. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  17. GRB 080604: VLA radio upper limit
  18. GRB 080605, Swift-BAT refined analysis
  19. GRB 080603B: VLA radio upper limit
  20. GRB 080605, Swift-BAT refined analysis
  21. GRB 080605: Swift-XRT refined analysis
  22. GRB 080605: MASTER VWF 46 s AT observation
  23. GRB 080605: Enhanced Swift-XRT position
  24. GRB 080605: GROND detection of the optical afterglow candidate
  25. GRB080605: optical observations
  26. GRB 080605: Liverpool Telescope optical afterglow candidate
  27. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  28. GRB 080605: TLS RRM Afterglow
  29. GRB 080605: Swift detection of a burst with an optical afterglow
  30. GRB 080603B: PAIRITEL infrared detection
  31. GRB 080603A: PAIRITEL infrared detection
  32. GRB 080603B: TLS Afterglow Observation
  33. Swift/UVOT observations of GRB080604
  34. GRB080604: HET redshift retraction
  35. GRB 080604, Swift-BAT refined analysis
  36. GRB 080604: Swift-XRT refined analysis
  37. GRB 080603B : Liverpool Telescope Observations
  38. Konus-Wind observation of GRB 080603B
  39. GRB 080603B: Swift-XRT refined analysis
  40. GRB 080603A: Swift-XRT detection of the afterglow
  41. GRB 080603B: Swift/UVOT detection of the afterglow
  42. GRB 080604: Enhanced Swift-XRT position
  43. GRB 080603B, Swift-BAT refined analysis
  44. GRB 080603A: Swift/UVOT detection of the afterglow
  45. GRB080603B: RTT150 optical observations, break in light curves
  46. GRB 080604: Early Super-LOTIS Observations
  47. GRB080604: confirmation of optical afterglow
  48. GRB 080604: Swift detection of a burst with an optical afterglow
  49. GRB 080516: TAROT La Silla observatory optical observations
  50. GRB080603B: NOT redshift
  51. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  52. GRB 080603B: Swift detection of a burst with optical afterglow
  53. GRB080603: Super-LOTIS detection of Optical Counterpart
  54. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  55. GRB 080603: Gemini-North redshift
  56. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  57. GRB 080602, Swift-BAT refined analysis
  58. GRB 080602: Swift-XRT refined analysis
  59. Konus-Wind observation of GRB 080602
  60. GRB 080602: Enhanced Swift-XRT position
  61. GRB 080602: Swift detection of a burst
  62. Swift analysis of BAT Slew Survey event (Trigger=009)
  63. Konus-Wind observation of reactivation of SGR 1627-41
  64. Reactivation of SGR 1627-41
  65. GRB 080524: Swift XRT and UVOT analysis
  66. GRB 080524: Swift-BAT detection of a burst in ground analysis
  67. GRB 080523: Swift-XRT refined analysis
  68. GRB 080523, Swift-BAT refined analysis
  69. GRB 080520: VLT host detection
  70. GRB 080523: VLT optical observations
  71. Swift/UVOT observations of GRB 080523
  72. GRB 080523: Enhanced Swift-XRT position
  73. GRB 080523: Swift detection of a burst
  74. GRB 080515: KPNO 4m NIR afterglow detection
  75. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  76. GRB 80516: Swift/UVOT Observations
  77. GRB 080515: Swift-XRT position and analysis
  78. GRB 080520, Swift-BAT refined analysis
  79. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  80. GRB 080514B: UVOT Observations
  81. GRB080520: Swift/UVOT observations
  82. GRB 080520, GROND observations
  83. GRB 080520: Enhanced Swift-XRT position
  84. GRB 080520: Swift XRT Refined Analysis
  85. GRB 080520: Swift detection of a burst with optical afterglow
  86. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  87. GRB 080517, Swift-BAT refined analysis
  88. GRB 080517: Swift-XRT refined analysis
  89. GRB 080517: Enhanced Swift-XRT position
  90. GRB 080517: Swift detection of a burst
  91. GRB 080516, SMARTS optical/IR observations
  92. GRB 080516: Swift-XRT Team refined analysis
  93. GRB 080516, Swift-BAT refined analysis
  94. GRB 080516: Enhanced Swift-XRT position
  95. GRB 080514B: NOT observations
  96. GRB 080516: Swift detection of a burst
  97. Errartum: VLA upper limit on GRB 080507
  98. VLA upper limit on GRB 080705
  99. IPN triangulation of bright GRB 080513
  100. Swift-BAT refined analysis for Trigger 311603: Galactic source

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov